Electrical terminal



Filed July 12, 1947 INVENTOR.

Patented Apr. 3, 195i ()FFiCE ELECTRICAL TERIAIN AL Edwin G. Hingelberg, Highland Park, Mich, assignor to George M. Holley and Earl Holley Application July 12, 1947, Serial No. 780,656

1 Claim. 1

The object of this invention is to mount an electrical terminal on an ignition system and to insulate the terminal from the supporting arm.

The specific object of this invention is to make it possible to remove and replace the electrical connection from the terminal without disturbing the adjustment of the spring bending force. The adjustment of this force determines the pressure between the tungsten alloy contact points and also the pressure between the fiber rubbing block and the cam. When this force is too weak the top speed of the engine is limited.

Fig. 1 shows a cross-sectional elevation of the terminal before it is locked in place.

Fig. 2 shows a cross-sectional plan view of the terminal locked in place together with the flat spring strip and the circuit breaker arm and the cam which operates the circuit breaker arm.

Fig. 3 shows the cross-sectional elevation through the paper insulation.

Fig. 4 is an end view of the terminal before being locked in place.

Fig. 5 shows the slot in the end of the steel spring.

In the drawing, it is the terminal, [2 is the square headed end, it is the round annular rim which extends from the squared end. This rim is shown rolled over the washer 36 in Fig. 2.

I5 is a flange at the inner end of the squared portion. I8 is the supporting brackets. 26 is the paper insulation placed between the terminal l0 and its supporting bracket I8.

22 is the flat steel spring strip which is slotted as shown. The thin conducting copper strip 24 is also shown slotted. An ordinary circuit breaker arm is shown around which is wrapped the thin metal strips 2224 in a well known manner. The arm carries a rubbing block of fiber 44.

A flat brass Washer 28 is threaded over the terminal and a split steel lock washer 30 may also be used but it is not absolutely necessary.

A nut 32 is used to lock the fiat spring 22 and the fiat conducting strip 24 against the flange in the preselected position of the spring 22.

Finally the nut 40 is used to lock the electrical connection in place.

A cam 42 engages with the fiber rubbing block 44 so as to separate the movable tungsten point 46 from the stationary tungsten point 48.

Operation The insulation 20 is first placed over the bracket 18 as shown. The terminal I0 is then inserted and the washer 36 is placed against the paper fit) Washer 20. The thin annular rim I4 is spun over and the terminal is mounted in place.

The spring 22 is adjusted so that the pressure exerted by the tungsten point 46 on the stationary tungsten point 58 is not less than 17 ounces and not more than 20 ounces. When this has been adjusted the nut 32 is tightened so that the contact pressure is kept at the selected value (17-20 ounces).

The electrical terminal is applied between the nut 32 and the nut 413. Hence this terminal can be removed without disturbing the adjustment of the spring 32.

The assembled spring 22 and bracket 18 may be factory adjusted so that the unit can be shipped as a spare with a predetermined load on contacts i648.

What I claim is:

A terminal and spring means for a circuit breaker, comprising a slotted spring connected to said circuit breaker, a bracket having an edge and a non-circular opening th rethrough adjacent said edge, a sheet of insulating material folded over said edge and having portions overlying opposite faces of said bracket, said portions having openings aligned with said non-circular opening, the opening in one of said portions being bounded by flaps extending into said non-circular opening, a stud having a non-circular portion extending through said aligned openings and between said fiaps, means on said stud engaging opposed outer faces of said insulating material to clamp said stud to said bracket in insulated relation thereto, said stud extending through said slotted spring, means clamping said spring to said stud and independent means for clamping an electrical conductor to said stud.

EDWIN G. HINGELBERG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 914,327 Barbour Mar. 2, 1909 996,874 Moak July 4, 1911 1,042,747 Ziegler Oct. 29, 1912 1,646,890 Tuska Oct. 25, 1927 1,766,908 Kindl June 24, 1930 1,801,584 Arthur et a1. Apr. 21, 1931 2,185,193 Hanson Jan. 2, 1940 2,211,412 Filko Aug. 13, 1940 

